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The Testo 557 features a complete four valve manifold and built in vacuum micron gauge, all in a low cost digital manifold. HVAC-R technicians can determine their evacuation limits with the built in micron vacuum gauge. Superheat and subcooling can be calculated in real time with two built in NTC temperature probe inputs. The 557 is the perfect digital manifold for servicing, maintaining and commissioning all types of air conditioning systems, as well as performing leak tests on AC/R systems with temperature compensation, insuring accurate results. With a rugged housing the Testo 557 will stand up to daily bumps and drops.
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